Search for: packed-bed-bioreactor
0.007 seconds

    Kinetics, experimental and simulation studies of Chinese Hamster Ovary cell growth in a packed-bed bioreactor

    , Article World Applied Sciences Journal ; Volume 15, Issue 11 , 2011 , Pages 1568-1575 ; 18184952 (ISSN) Shakibaie, M ; Tabandeh, F ; Zomorodipour, A. R ; Mohammad-Beigi, H ; Ebrahimi, S ; Habib Ghomi, H ; Sharif University of Technology
    To figure out the relationship between nutrient deprivation and cell growth, simulation can be effective. In the present work, the growth of Chinese Hamster Ovary (CHO) cells was simulated based on stoichiometric and kinetics calculations. The simulation results were compared to the experimental data from a packed-bed bioreactor and a good agreement was observed. The kinetic parameters (K Glc, K Amn, K Lact and μ Max) were optimized by a genetic algorithm method using stoichiometric parameters (Y X/Glc, Y X/Amm, and Y Lac/Glc). The stoichiometric and kinetic parameters were used in the simulation to study the growth of CHO cells. The concentrations of the toxic by-products, ammonium and... 

    Optimization of ferrous biooxidation rate in a packed bed bioreactor using Taguchi approach

    , Article Chemical Engineering and Processing: Process Intensification ; Volume 46, Issue 10 , 2007 , Pages 935-940 ; 02552701 (ISSN) Mousavi, S. M ; Yaghmaei, S ; Jafari, A ; Vossoughi, M ; Ghobadi, Z ; Sharif University of Technology
    The biological oxidation of ferrous ion by iron-oxidizing bacteria is potentially a useful industrial process for removal of H2S from industrial gases, desulphurization of coal, removal of sulfur dioxide from flue gas, treatment of acid mine drainage and regeneration of an oxidant agent in hydrometallurgical leaching operations. The main purpose of this study was to find optimum values of the process parameters on the ferrous biooxidation rate by immobilization of a native Sulfobacillus species on the surface of low density polyethylene (LDPE) particles in a packed-bed bioreactor using Taguchi method. Five control factors, including temperature, initial pH of feed solution, dilution rate,... 

    Influence of process variables on biooxidation of ferrous sulfate by an indigenous Acidithiobacillus ferrooxidans. Part II: Bioreactor experiments

    , Article Fuel ; Volume 86, Issue 7-8 , 2007 , Pages 993-999 ; 00162361 (ISSN) Mousavi, S. M ; Yaghmaei, S ; Jafari, A ; Sharif University of Technology
    The oxidation of ferrous iron in solution using Acidithiobacillus ferrooxidans has industrial applications in the regeneration of ferric iron as an oxidant agent for the removal of hydrogen sulfide from waste gases, desulphurization of coal, leaching of non-ferrous metallic sulfides and treatment of acid mine drainage. The aim of this attempt was to increase the biooxidation rate of ferrous sulfate by using immobilized cells. Rate of ferrous iron oxidation was determined in a packed-bed reactor configuration with low density polyethylene (LDPE) particles as support material in order to find the most practical system for scale-up. The present work studies the influence of basic parameters on... 

    Bed moisture estimation by monitoring of air stream temperature rise in packed-bed solid-state fermentation

    , Article Chemical Engineering Science ; Volume 61, Issue 17 , 2006 , Pages 5654-5663 ; 00092509 (ISSN) Khanahmadi, M ; Roostaazad, R ; Mitchell, D. A ; Miranzadeh, M ; Bozorgmehri, R ; Safekordi, A ; Sharif University of Technology
    We develop a method for predicting the moisture content of the fermenting solids in an intermittently mixed packed-bed bioreactor on the basis of measurements of the inlet and outlet gas stream temperatures and the assumption that both the gas streams are saturated with water vapor. This method can be used to estimate when an intermittently mixed packed bed should be mixed and how much water should be added during the mixing event. The predictions were experimentally verified for the growth of Aspergillus niger on wheat bran in a thin packed bed. We show that the application of a controller based on our estimation method would have led to adequate moisture control, with significant errors in... 

    Bio-oxidation of ferrous ions by Acidithioobacillus ferrooxidans in amonolithic bioreactor

    , Article Journal of Chemical Technology and Biotechnology ; Volume 84, Issue 4 , 2009 , Pages 504-510 ; 02682575 (ISSN) Kahrizi, E ; Alemzadeh, I ; Vossoughi, M ; Sharif University of Technology
    Background: The bio-oxidation of ferrous iron is a potential industrial process in the regeneration of ferric iron and the removal of H2S in combustible gases. Bio-oxidation of ferrous iron may be an alternative method of producing ferric sulfate, which is a reagent used for removal of H2S from biogas, tail gas and in the pulp and paper industry. For practical use of this process, this study evaluated the optimal pH and initial ferric concentration. pH control looks like a key factor as it acts both on growth rate and on solubility ofmaterials in the system. Results: Process variables such as pH and amount of initial ferrous ions on oxidation by A. ferrooxidans and the effects of process...